div.image_map {
  position: relative;
}

div.image_map_image {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 0;
}

div.image_map_cursor {
  width: 10px;
  z-index: 2;
}

div.image_map_key {
  position: absolute;
  z-index: 1;
}